100.7: The decibel level during festival season in 2020, Mumbai’s quietest in two decades
9.5: Estimated total sales (in billions of dollars) of speakers this year in China, the biggest market in the world
88,000: Roughly the number of helicopter flights between 2017 and 2019 in and around Washington, D.C.
▰ ▰ ▰
¹Footnotes: Mumbai: [indiatimes.com](https://mumbaimirror.indiatimes.com/mumbai/other/how-coronavirus-aided-mumbais-anti-noise-pollution-campaign/articleshow/80189081.cms). Speakers:
[statista.com](https://www.statista.com/outlook/15010500/109/speakers/united-states). Helicopters: [washingtonpost.com](https://www.washingtonpost.com/local/trafficandcommuting/gao-recommends-faa-create-centralized-system-for-tracking-helicopter-noise/2021/01/08/850afde6-51de-11eb-b96e-0e54447b23a1_story.html).
*Originally published in the January 11, 2021, edition of the This Week in Sound email newsletter ([tinyletter.com/disquiet](https://tinyletter.com/disquiet)).*